Viking LDB-3 Loop and Ring Detect Board The Viking LDB-3 Loop and Ring Detect Board monitors analog phone line for ringing and/or an off hook condition. It is ideal for monitoring line status or for providing a visual indication of such. Features Detects ring voltage and off hook loop current On/off switches for ring detection and off hook/loop detection Screw terminal connections Selectable ring cadence mode (relay can remain on between rings) Wall mountable with foam tape (included) or screws (not included) Switched 12V DC output (follows relay activation for powering strobe lights, cameras, etc.) One set of (NO) normally open or (NC) normally closed relay contacts provided Includes Atlas 1-Year Warranty with Extended Warranty options available! Documents Viking LDB-3 DataSheet